feat: allow disabling fading recent messages (#6121)

src/messages/layouts/MessageLayout.cpp

@@ -249,7 +249,8 @@ MessagePaintResult MessageLayout::paint(const MessagePaintContext &ctx)
                              ctx.messageColors.disabled);
     }
 
-    if (this->message_->flags.has(MessageFlag::RecentMessage))
+    if (this->message_->flags.has(MessageFlag::RecentMessage) &&
+        ctx.preferences.fadeMessageHistory)
     {
         ctx.painter.fillRect(0, ctx.y, pixmap->width(), pixmap->height(),
                              ctx.messageColors.disabled);

src/messages/layouts/MessageLayoutContext.cpp

@@ -106,6 +106,12 @@ void MessagePreferences::connectSettings(Settings *settings,
             this->lastMessagePattern = static_cast<Qt::BrushStyle>(newValue);
         },
         holder);
+
+    settings->fadeMessageHistory.connect(
+        [this](const auto &newValue) {
+            this->fadeMessageHistory = newValue;
+        },
+        holder);
 }
 
 }  // namespace chatterino

src/messages/layouts/MessageLayoutContext.hpp

@@ -55,6 +55,8 @@ struct MessagePreferences {
     bool alternateMessages{};
     bool separateMessages{};
 
+    bool fadeMessageHistory{};
+
     void connectSettings(Settings *settings,
                          pajlada::Signals::SignalHolder &holder);
 };